Systematic evaluation of iterative deep neural networks for fast parallel MRI reconstruction with sensitivity-weighted coil combination
Hammernik K, Schlemper J, Qin C, Duan J, Summers RM, Rueckert D (2021)
Publication Type: Journal article
Publication year: 2021
Journal
Book Volume: 86
Pages Range: 1859-1872
Journal Issue: 4
DOI: 10.1002/mrm.28827
Abstract
Purpose: To systematically investigate the influence of various data consistency layers and regularization networks with respect to variations in the training and test data domain, for sensitivity-encoded accelerated parallel MR image reconstruction. Theory and Methods: Magnetic resonance (MR) image reconstruction is formulated as a learned unrolled optimization scheme with a down-up network as regularization and varying data consistency layers. The proposed networks are compared to other state-of-the-art approaches on the publicly available fastMRI knee and neuro dataset and tested for stability across different training configurations regarding anatomy and number of training samples. Results: Data consistency layers and expressive regularization networks, such as the proposed down-up networks, form the cornerstone for robust MR image reconstruction. Physics-based reconstruction networks outperform post-processing methods substantially for R = 4 in all cases and for R = 8 when the training and test data are aligned. At R = 8, aligning training and test data is more important than architectural choices. Conclusion: In this work, we study how dataset sizes affect single-anatomy and cross-anatomy training of neural networks for MRI reconstruction. The study provides insights into the robustness, properties, and acceleration limits of state-of-the-art networks, and our proposed down-up networks. These key insights provide essential aspects to successfully translate learning-based MRI reconstruction to clinical practice, where we are confronted with limited datasets and various imaged anatomies.
Involved external institutions
Imperial College London / The Imperial College of Science, Technology and Medicine
United Kingdom (GB)
Hyperfine Research Inc.
United States (USA) (US)
US National Institutes of Health (NIH)
United States (USA) (US)
United Kingdom (GB)
Hyperfine Research Inc.
United States (USA) (US)
US National Institutes of Health (NIH)
United States (USA) (US)
How to cite
APA:
Hammernik, K., Schlemper, J., Qin, C., Duan, J., Summers, R.M., & Rueckert, D. (2021). Systematic evaluation of iterative deep neural networks for fast parallel MRI reconstruction with sensitivity-weighted coil combination. Magnetic Resonance in Medicine, 86(4), 1859-1872. https://doi.org/10.1002/mrm.28827
MLA:
Hammernik, Kerstin, et al. "Systematic evaluation of iterative deep neural networks for fast parallel MRI reconstruction with sensitivity-weighted coil combination." Magnetic Resonance in Medicine 86.4 (2021): 1859-1872.
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